Comic

Status

Dum-E and U are the robots Tony Stark uses as assistants in his workshop. He made Dum-E in his father's workshop. While Dum-E is generally used to help with Tony Stark's creations, U is used to do the registration of Stark's work using a video camera. They had even saved his life, yet Stark constantly gets angry at the robots. Dum-E and U had helped make some of Stark's armors.

After Stark learned of a new element discovered by his father, he decided to rebuild the element to fix his current arc reactor. Dum-E helped him make the element. Afterwards, Stark tasked Dum-E with cleaning up the mess that the new element's creation caused.[2]